Batman with Robin the Boy Wonder, to my knowledge, has had no DVD
release, sadly. I only knew of it because of a five episode VHS from 1992.

Captain N has the whole series in a boxset. Apparently it's missing some
stuff, though. Don't ask me!

Captain Scarlet has it's entire series out on DVD in both the UK and US.

There's a few five episode DVDs for The Real Ghostbusters,
but a complete series is out, I hear!

Hulk Hogan's Rock 'n' Wrestling
exists only as ancient VHS tapes

The Incredible Crash Dummies,
unfortunately, only had a VHS release back in 1993, and I can't imagine it
appearing again anytime soon. There's no downloads on the internet, either! Only
a low quality YouTube video which is my source for the images. Lame.

Sonic Underground's all out on DVD, in both individual volumes and as a boxset.
I think. I don't care to check!

Street Sharks only has crappy two episode volumes that nobody would
willingly buy, but any existent fan club out there would suggest you do so in a
feeble attempt to get the whole series out. If only.

Teenage Mutant Ninja Turtles has seasons released, and just from a quick
check on Amazon, season 6 is out. How about that!

See Transformers for that kettle of fish. Scramble City is generally on the movie or anime DVDs.